<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        var arr = [12,34,45,123,463,234,64]
        console.log(arr.slice(0,3))
        console.log(arr.splice(2,1))
        console.log(arr)
    </script>
</head>
<body>
    
</body>
</html>